{\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}\begin{tabular}{l*{1}{cccc}}\hline \hline
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}\\
                    &\multicolumn{1}{c}{Birth weight (grams)}&\multicolumn{1}{c}{Gestation length (weeks)}&\multicolumn{1}{c}{Very low birth (weight<1,500g)}&\multicolumn{1}{c}{Very preterm birth (weeks<32)}\\
 \hline \\ [-1.8ex] & \multicolumn{4}{c}{Panel a)} \\
Pollution in w-4 weeks&    -0.35324   &    -0.00104   &     0.00007*  &     0.00009** \\
                    &   (0.25935)   &   (0.00089)   &   (0.00004)   &   (0.00004)   \\
[1em]
Observations        &      100745   &      100745   &      100745   &      100745   \\
 

 \hline \\ [-1.8ex] & \multicolumn{4}{c}{Panel b)} \\
Pollution in w-8 weeks&    -1.00257***&    -0.00250** &     0.00012** &     0.00015***\\
                    &   (0.32837)   &   (0.00111)   &   (0.00005)   &   (0.00005)   \\
[1em]
Observations        &       78827   &       78827   &       78827   &       78827   \\
 

 \hline \\ [-1.8ex] & \multicolumn{4}{c}{Panel c)} \\
Pollution in w-12 weeks&    -0.78729*  &    -0.00232   &     0.00008   &     0.00012*  \\
                    &   (0.43613)   &   (0.00154)   &   (0.00007)   &   (0.00007)   \\
[1em]
Observations        &      61,831   &      61,831   &      61,831   &      61,831   \\
Mean Dep. Variable  &   3,217.317   &      38.981   &       0.005   &       0.005   \\
R-squared           &       0.192   &       0.189   &       0.172   &       0.184   \\
Year FE             &         Yes   &         Yes   &         Yes   &         Yes   \\
Locality FE         &         Yes   &         Yes   &         Yes   &         Yes   \\
Cluster level       &    Locality   &    Locality   &    Locality   &    Locality   \\
\hline \hline \end{tabular}}
